Hey there, I do hear the occasional rub in the front when I hit a big dip in the road, but it's really nothing to worry about. It sounds more like fender liner scuffing than rubber to metal. I was getting this with front camber set at about -1.5 and don't think I will go any more aggressive than that. I had spacers before I was lowered so I couldn't tell you if it would still rub without the extra 20mm.
Alright, a fellow Saab enthusiast! I sold mine this past August, it was just too much trouble at the power level I was running. It also could not have been anymore different to the Z, the Z is so much more capable in every way.